const planets=[];
module.exports=planets;
const { rejects } = require('assert');
const fs=require('fs');
const { resolve } = require('path');
const path=require('path');
const parse=require('csv-parse').parse;
const habitablePlanets=[];
function isHabitablePlanet(planet){
    return planet['koi_disposition']==='CONFIRMED'
    && planet['koi_insol']>0.36 && planet['koi_insol']<1.11
    && planet['koi_prad']<1.6;
}
function loadPlanetsData(){
    return new Promise((resolve,reject)=>{
        fs.createReadStream(path.join(__dirname,'..','..',
        'data','kepler_data.csv'))
        .pipe(parse({
            comment:'#',
            columns:true,
        }))
        .on('data',(data)=>{
            if(isHabitablePlanet(data)){
                habitablePlanets.push(data);
            }
        })
        .on('error',(err)=>{
            console.log(err);
            reject(err);
        })
        .on('end',()=>{
            console.log(`找到${habitablePlanets.length}个可居住星球！`);
            resolve();
        });
    });
}
function getAllPlanets() {
    return habitablePlanets;
   }
module.exports = {
    loadPlanetsData,
    getAllPlanets,
   };